New submission from Ben Darnell: The new collections.abc.Awaitable ABC relies on __instancecheck__, which makes it incompatible with functools.singledispatch (singledispatch works based on args[0].__class__; any instance-level information is discarded). This surprised me because the first thing I tried to do with Awaitable was add it to my singledispatch-based coroutine compatibility layer.
Ideally coroutine would be an actual subclass of generator, instead of a generator with an extra bit set on the instance that changes how it answers isinstance() checks. That would be a big change, though, so it might be better to just document that Awaitable is kind of unusual (if we weren't already in the beta period I might argue that the ABCs should be removed and we should just use the functions in the inspect module instead). ---------- components: asyncio messages: 244942 nosy: Ben.Darnell, gvanrossum, haypo, yselivanov priority: normal severity: normal status: open title: Awaitable ABC incompatible with functools.singledispatch versions: Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue24400> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
